From: "jehan.procaccia" <jehan.procaccia@int-evry.fr>
Subject: Re: async vs. sync
Date: Mon, 22 Nov 2004 19:57:42 +0100
Message-ID: <41A236A6.4050104@int-evry.fr>
References: <482A3FA0050D21419C269D13989C61130435EB6E@lavender-fe.eng.netapp.com>	 <20041122153655.GH1291@suse.de>  <41A2280B.1010005@int-evry.fr> <1101146906.11196.35.camel@lade.trondhjem.org>
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Cc: Olaf Kirch <okir@suse.de>, nfs@lists.sourceforge.net,
	mci-unix@int-evry.fr
To: Trond Myklebust <trond.myklebust@fys.uio.no>
In-Reply-To: <1101146906.11196.35.camel@lade.trondhjem.org>
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Trond Myklebust wrote:

>m=E5 den 22.11.2004 Klokka 18:55 (+0100) skreiv jehan.procaccia:
>
> =20
>
>>My users won't accept the sync performances !
>>   =20
>>
>
>Will they accept data loss in case of a server crash? If they don't
>care, then hey - you're safe...
> =20
>
in my old solaris 7 nfs it was async I suppose ! although we didn't lose=20
data, maybe we where risking it ... ? anyway now I move from and old=20
solaris NFS server to a brand new linux one with a SAN (AX100) Storage=20
Processor in Raid 5 an Fiber Channel attachement, how can I support=20
performances more than 50 times longer :-( with that config,  user and=20
manager wil tell me that I  spoild money on that new server !, there=20
must be a misconfiguration somewhere ?.

>BTW: I've never seen a slowdown as bad as that. Just out of curiosity,
>what happens if you turn off ACL support and/or use a client from
>ftp.kernel.org, with no ACL support.
> =20
>
I did it on the server export option (no_acl) , no better performance.=20
However I don't know why I have ACLs,  I nerver ask for it !?
/etc/fstab on the server
/dev/emcpowerp1         /p2v5f1         ext3   =20
defaults,usrquota,grpquota     1 2

>(NOTE: the reason I've rejected ACLs so far in the mainline client is
>the lack of support for caching in the patches I've seen so far)
>
>Cheers,
>  Trond
> =20
>


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